1. ## Help Please (Homework :P)

Sita puts 5 balls in Box A and 4 Balls in Box B.
The balls are numbered.

Box A-balls numbered 1-5
Box B-balls numbered 1-4

What is the probability that the sum of the numbers on the balls is less than 5?

2. I have worked out that the answer is maybe 3/10.........do you think this is correct?

3. Originally Posted by Nat077
I have worked out that the answer is maybe 3/10.........do you think this is correct?
The possible combinations of 3=
Sample space: (BoxA, BoxB): (1,1); (1,2); (1,3); (2;1); (2,2); (3,1).

Total combinations= 20.

P(X<5)= 6/20= 3/10.

4. Hello, Nat077!

I have worked out that the answer is maybe 3/10
Do you think this is correct?
Yes, I do!

There are: . $5 \times 4 \:=\:20$ outcomes.
. . And six of them have a sum less than 5: . $(1,1),\1,2),\1,3),\;(2,1),\2,2),\3,1)" alt="(1,1),\1,2),\1,3),\;(2,1),\2,2),\3,1)" />

$P(\text{sum}< 5) \:=\:\frac{6}{20} \:=\:\frac{3}{10}$

. . . Good work!